NO. 2018. SYNOPSIS OF GENERA OF AOROMYZID^—MALLOCH. 151 



erate length, vibrissa well differentiated ; occiput linear. Mesonotum 

 with 4 pairs of dorso-centrals and in one specimen with slight indica- 

 tions of longitudinal vittse; disk with sparse, short black setulse; scu- 

 tellum with four bristles. Abdomen: All segments with numerous 

 short, black surface hairs, longer on lateral margins; ovipositor glossy, 

 brownish or blackish, as long as, or slightly longer than, last abdom- 

 inal segment. Legs with apical tarsal joint darkened, and all surfaces 

 covered with short black setulse; hind femur thickened slightly; hind 

 tibia with apical half thickened somewhat. Wings with first costal 

 division one-half the length of second; third about one-fifth as long 

 as second, and one-half as long as fourth; costa extending slightly 

 beyond end of third vein; second vein slightly waved; third straight; 

 fourth straight, ending slightly behind wing tip; sixth vein not 

 reaching wing margin. 



Length. — 4.5 mm. 



Type.— Cat. No. 15809, U.S.N.M. 



Locality. — Ungava Bay, Labrador (L. M. Turner), with the type in 

 another female in rather poor condition. 



PHYTOMYZA NITIDULA, new species. 



Female. — Shining black. Squamse and halteres whitish. Wings 

 whitish, veins 1-3, and costa, black. 



Frons parallel-sided, barely one-third wider than either eye ; center 

 stripe opaque; four orbital bristles present, the upper pair strongest; 

 antennae of moderate size, third joint with a short, thornlike pro- 

 duction at upper angle of apex; arista threadlike, bare, slightly longer 

 than breadth of frons; face in profile slightly concave, receding 

 toward mouth; eyes distinctly higher than long; cheeks narrow at 

 anterior margin, at posterior margin less than one-third as high as 

 eye; occiput distinct; margmal cheek bristles distinct; vibrissa not 

 much differentiated. Mesonotum (rather rubbed in tjrpe) with 3 

 pairs of dorso-centrals of moderate length, the posterior pak much the 

 strongest; disk covered with short black setulse; scutellum with four 

 bristles. Abdomen broadly ovate; surface of segments finely granu- 

 lose ; all segments with short, scattered, black hau-s, which are longest 

 on lateral and posterior margins of apical two segments. Legs nor- 

 mal. Wings with costa falling almost as far short of apex of fourth 

 vein as length of second costal division ; first costal division one-fourth 

 shorter than second ; second twice as long as third ; veins 2-3 divergent; 

 almost straight; fourth vein ending in wing tip; veins 4-6 indistinct. 



Length. — ^1.25 mm. 



Type.—Ceit. No. 15808, U.S.N.M. 



Locality.— HoltYiile, California (V. L. Wildermuth), Webster No. 

 6149. 



